Insert a caption paragraph after the specified paragraph.
AI agents use insert_caption to create or update resources in Docx — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Docx environment.
This tool creates and adds new caption content to a Word document, which is a reversible modification. It does not execute arbitrary code, delete data, move money, or have destructive effects. The action is limited to inserting a single caption element, making it a Write operation with low severity since captions are typically cosmetic document elements with minimal blast radius.
From the tool's definition Tool name 'insert_caption' and description 'Insert a caption paragraph after the specified paragraph' indicate creation of new content within a document.
Documented attack patterns abuse exactly the kind of access insert_caption gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Docx, and nothing reaches the server without passing your rules. This is the rule we recommend for insert_caption:
{
"version": "1",
"default": "deny",
"tools": {
"insert_caption": {
"limits": [
{
"counter": "insert_caption_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}insert_caption stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.
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Insert a caption paragraph after the specified paragraph. It is categorised as a Write tool in the Docx MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Docx MCP server in PolicyLayer and add a rule for insert_caption: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Docx. Nothing to install.
insert_caption is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the insert_caption rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for insert_caption. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
insert_caption is provided by the Docx MCP server (securityronin/docx-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Docx, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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219 Docx tools catalogued and risk-classified — across an index of 43,000+ MCP servers.